**Complete to solve $52 + 19$.**
$\phantom{=}52+19$
$=(51+$ [[☃ input-number 1]]$)+ 19$
$=51 + ($[[☃ input-number 2]] $+ 19)$
$=51 + $ [[☃ input-number 3]]
$=$ [[☃ input-number 4]]
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